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MLA

United States Bureau of Dairy Industry, and United States Office of Experiment Stations. "Butter As a Source of Vitamin A In the Diet of the People of the United States." , online. Print

APA

United States Bureau of Dairy Industry, U. States Bureau of Dairy Industry, & United States Office of Experiment Stations, U. States Office of Experiment Stations. (1947). Butter as a source of vitamin A in the diet of the people of the United States.

Chicago

United States Bureau of Dairy Industry., and United States Office of Experiment Stations. "Butter as a source of vitamin A in the diet of the people of the United States" (0000): online.